dolphins. they even rode the dolphins around the tank. >> i'm riding a dolphin! >> reporter: in just two short hours, an emotional connection between the veterans and the dolphins, end up with kisses. >> i just want to feed them fish, and swim with them. >> reporter: this was the first time these wounded warriors got to work with these dolphins, and with such a big success, that the program's now thinking about having other soldiers come here for future treatment. as for these 10 veterans, they left with big smiles. and even a gift. paintings from the dolphins. >> go to bed, just excited, and you know, happy, and hopefully not having any nightmares. >> reporter: in vallejo, i'm da lynn. cbs 5. the national park service is honoring veterans this weekend by offering free admission to all of them, nearly 400 parks are covered, and that includes your woods in marin county. the usual price of admission is $7 but from now through monday, everyone gets in free.